The alarm
Life OS has an alarm you cannot sleep through. When it rings it keeps coming back until you are up.
Setting it
Open Sleep and set your wake time, or ask your ELO: "Wake me at 6:30 tomorrow" (one date only) or "Wake me at 7 on weekdays".
It adapts
With Smart bedtime on, tonight's bedtime is worked out backward from your alarm and your sleep need.